Auto-tire changer



F. MARTIN.

AUTO TIRE CHANGER.

APPLICATION FILED OCT. 30, 1919.

1,354, 1 1 8', Patented Sept. 28, 1920 INVENTOR.

A TTORNE Y.

UNETED STATES FRANK MARTIN, OF CHANDLER, OKLAHOMA.

AUTO-TIRE CHANGER.

Specification of Letters Patent.

Patented Sept. 28, 1920.

Application filed Qctoher 30, 1819. Serial N0. 334,573.

To all whom it may concern Be it known that I, FRANK MARTIN, a citizen of the United States, residing at Chandler, in the county of Lincoln and State of Oklahoma, have invented certain new and useful Improvements in Auto-Tire Changers, of which the following is a specification.

.My invention relates to tools for putting on and taking off autombile tires.

My object is to provide a device of this character for expanding or contracting demountable rims at the will of the operator in putting on and taking off automobile tires.

A leading feature of the invention consists in a supportingv plate having a rotatable member thereon provided with a plurality of tangentially arranged arms adapted for guided longitudinal movement on said plate, said arms having means at their outer ends'for engaging the rim to expand or contract the same; a handle portion for operating said rotatable member; and means for engaging the handle to hold the parts of the device in different adjusted positions.

The invention consists in certain novel features or" construction and arrangement of parts, as will be hereinafter more fully described and claimed, reference being had to the accompanying drawings, in which 2-- Figure 1 is a top plan view of my improved tire changer.

Fig. 2 is a side elevation of Fig. 1 looking in the direction of the arrow X.

Fig. 3 is a perspective view of one of the tangential arms showing its connection with the rotatable member; and

Fig. i is a sectional view of the ratchetengaging portion of the handle of my device, said section being taken on the line it Fig. 1 looking in the direction of the arrow.

The numeral 1 indicates the base plate oi my device, upon which is mounted the rotatable member 2, said member consisting of the cross bars 2 and 2 having a central bore 3 for the reception of the bolt 4 which is rigidly carried in the base plate.

The cross bar 2 is extended at one end to form a handle 2 with a thin inclined section 2 at the base of the handle between the same and the main portion of said cross bar 2 The tangential arms 5 are pivoted at their inner ends to the cross bars 2 and 2 by means of the pivots 6, which pivots are all equidistant from the center of the rotatable member 2 formed by said cross bars.

The arms 5 are provided at their outer eifids with the hooks 7, and at the inner sides 0 engage the inner periphery of the rims. These shoes are pivotally supported on the arms 5 by mean of the pivots 9.

The arms 5 near their outer ends rest upon blocks 10 which are rigidly mounted on the base plate 1, and upon these blocks are friction r llers l0 which serve as guides for the longitudinal movement of the arms 5.

If so desired, the central opening 3 of the rotatable member 2 of my device may also be provided with anti-friction bearings.

The plate 1, at its side from which the handle of the device projects, is provided with upper and lower raclrbars 11 and 12 respectively, and these rack bars have on their inner opposing faces ratchet teeth 11 and 12 respectively. The thin inclined portion 2 of the handle member is received between these two rack bars, and the handle portion of the device has suiticient lateral play to permit it to be drawn into engagement with the teeth of either rack bar, as oocasion may require.

The operation of my device is extremely simple. When the parts are in position as shown in Fig. 1, and the rim with a tire thereon is placed on the device with its inner periphery engaging the inner part of the rim, a movement of the handle inwardly toward the position indicated by dotted lines will move the bars 5 with the shoes 8 outwardly and thus expand the rim thus unlocking the rim. A movement of the handle outwardly will engage the hooks at the end of bars 5 on the outer curved side of the rim and continuing the movement outwardly of said handle will contract the rim so that the tire may be easily removed therefrom. When the handle is moved to the desired position to impart to the rim the desired degree of contraction or expansion it is forced slightly downward or upward to bring the lower or upper edge of the flattened inclined portion 2 into engagement with one of the notches 12 to hold the handle to the desired point of adjustment.

When it is desired to place a tire on a rim the rim is placed on the device and contracted in the same manner as heretofore exthese hooks with rim shoes 8 adapted to,

plained, the tire placed thereon and by an inward movement of the handle to the position indicated'by dotted lines will move the bars'5 with the shoes 8 outward and thus expand the rim, thus enabling the rim tobe easily locked, with the device thereon.

at their outer projectingends and rim shoes between 7 said hooks and said guides; upper and lower stop bars secured to the base plate at one side of the rotatable member; a handle connected with said rotatable member for operating the same, said handle passing between said stop bars and projecting beyond the base plate, said stop bars having ratchet teeth on their opposing faces for engaging the top and bottom sides of said handle to hold the same in adjusted positions, theteeth on one bar being adaptedto hold the handle against movement in one direction and the teeth on the other bar being adapted to hold it against movement in the opposite direction.

2. In a device of the character described, a base plate; a'rotatable member mounted thereon; tangential arms longitudinally movable on said plate, said arms being pivoted at their inner ends to said rotatable member. with their outer ends projecting beyond the base plate; guides for the outer ends of said arms consisting of friction rollers mounted at opposite sides of each arm,

said guides being supported on the base plate, said arms having hooks at their outer projecting ends and pivoted rimshoes between said hooks and said guides; upper and lower stop bars secured to the base plate at one side of the rotatable member; a handle connected with the rotatable member for operating the device, said handle passing between said stop bars and projecting beyond the base plate, the portion of the handle passing between the stop bars being formed into an inclined section said ratchet bars having oppositely inclined ratchet teeth on their respective opposing faces for engaging the top and bottom edges of said inclined portion of the handle, the teeth on one. bar being adapted to engage the upper edge of the inclined portionof the handle to hold it against movement in one direction, and the teeth on the other bar being adapted to engage the opposite edge of said inclined portion of the handle to hold it against movement in the opposite direction.

In testimony whereof I afliX my signature.

, FRANK MARTIN. 

